Electric driving installation



Feb. 15, 1921.

N. JAPOLSKY ET AL ELECTRIC DRIVING INSTALLATION Filed 00:. 1 1922 IV-Japolsky d: M. Kosreuxo m Ytu'rORs Patented eb. 15, 1927.

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. -A'pp ca io 1ii edifl tob j Th-isdnvention relatesto electric drivinginstallations and its main pbject is to provide a form of drive.whichshall ,permit of the. use. of the simplest typeof vmotor ,while:..:=5 providing; for; the complete andetfective contriol t sp e nimatestl th m l we e arr ng d :.W- .e .ee.,s.na ava ab i Wa y-sma l. s T -drin ships. rrepel er "and. power rollers. I no t n iega tl? .ntmq er il.,.. d

.this is supplied withits full drivirl g, current n; g ner erswllie tiadart tam-g u e a cn tant peeden to, prov de th -whol vpo a yvequ w,z-uli l Permi tin fits irefluen y: .andwqlte e t h artene .Fprl h mared: t g ne te? i pns tuted i by a alter at ng. emf-tent omma a iee- 111which the stator and rotor .main power cur a m are ar a ged. on .Wi a yent i 1 winding, (and the other with' a ,discpntinuous zwind ngit eariea areu Pha s. Ot t h alternat ng entrant me heme nn te across thegap ott i idis ee ia as Wi din .i mnd r; .5 ta e .aeat a zatien fith stao and ro enme nipew np urenteee e he: .bes conditions an th magneti fieof said generator being wholly provided by all-ex iting ;F E f0. ;ifl/ Qarat exit g machine, which is provide with means whereby its frequencymay be controlled.

In Qrtlenthat; t11e,iriyenti on may be better u erstopdya ieteneet willM be made to the accompanying diagrammatic drawings in which Fig. 1 is across section of the stator and rotor of the commutator generator.

Fig. 2 shows an arrangement comprising an asynchronous motor, fed from acommutator generator, having a separate winding on the rotor with whicha synchronous exciter is connected.

Fig. 3 shows a modification of the commutator generator with excitationcurrent fed to the rotor, using the rotor power winding at the same timein the capacity of exciting winding.

The alternating-current commutator-generatorherewith proposed (which inthe following description will be referred to as a commutator-generator)is composed, as shown in Fig. 1, of stator S with non-salient poles, androtor R, with its commutator K.

In Fig. 2, a primary exciter-winding is distributed on the rotor, butalternatively the exciting current can be passed through part of theworking or power windings V 1,617,394 nearereae, s nai. No. 595,0912,and. in .switzerlandg-Mareh; 21,1322. 1;

and iv for, instance, scheme 1? shows a L case of a three-phaseexcitingacill ei ywhich the. 12 phase rotor1wintli11g ,lV', tensed aseXciter-winding. The excitei windin isiin both schemes provided withits;oute'r-;terminals' I 11,-, 111 and also withhthe ,sjliding brushesd.e....f. gThislexciter Winding 1Sgf6d with, alternating current'atvariable frequency. whichis; furnished a ,'separate generator. j

The .working winding is ,distributedfjon thestator as well as onthe.,r.oto'r, .the windi P W5 distributed lik t. ;.Q ."-.(se Figs. 2 and3), eonsisting'o f separhtQp'arts .h viug r na a a h-end.lizltallgrl 7etc, whilst the other winding-part. QVFI. ,dis-

tributed, onl the rotor, is connected with the commutator K. ...The.statorwinding W and the rotor winding ,Wfiare connected "at, electrically corresponding.pointswith eacli other y a so rushe l eli iF g 2);: .I;in this case the actual numberiofrturn sl,

of the stator Zis nade equal to t lieactual number of turns fiof therotor Wf,.,the result .is that; their jmutual, efie ct 'isliieutrali ea(n .the small leakage (lisrega ded, as it, can .be omp ns ed byrtheiliepe ve shi ting th b ush an h s ft o Wifi i .and llVFQwill not coast withthe je'Xciter as iat e ca vi hiw idii ig .im ti-a Qrm v.

' n his way there m y be iob ain t .qm-

pensated cominutator-generator, the total power taken from whichgenerator, as well as-the mechanical and the copper losses, are to befurnished by its driving machine, whilst the iron-losses alone are to beprovided by an alternating current exciter E. Thus the exciter can bekept small in relation to the commutator generator, and therefore itsspeed can be easily regulated.

The voltage of the commutator generator depends, as in other generators,on the exciting current and the speed of rotation, but the frequency ofthe commutator generator is determined by the frequency of its excitingfield. When the commutator generator is excited from its stator, itsfrequency is equal to the frequency of the exciting current. When thegenerator is excited from the rotor its frequency is equal to thealgebraic sum of two frequencies, namely. the frequency of the excitingcurrent, and the frequency corresponding to the speed of the generator.

In both cases, at a constant speed of li-ang d epm iecelyseparate1other, 'thus having six terminals; and the the generator, itsffrequencycan" be, easily changed by changing the frequency of the excitingcurrent i. e. by changing the speed of the exciter. 1

The exciter VB is also its voltage cont-rolled.

If the right choice is Inadeot the rela tion between the frequencyof thealtei'nat ing currentexciter ,VVE and its voltage, then all the desiredgraduations between-the turnmg momentsfof the asynchronous mo'tor can beobtained the start and at the normal speedie The. driving motor ofthe-alternating-current exciter may. be of any kind, provided its speedcan be easily varied.

The exciter winding may be arranged 'to have the same "or n'differentnumber "of phasesto the working winding "ImFigZ 52 the:exciting current is brought throughslip rings to a sep ar'ate windingsaid'winding being arranged in star-connection to a neutral point. l

' The f outsidecurrent which is utilized to drivethe motor- AMis'lorought to'thjeina- ,chineby thefterminals'flI 111 111, H I1 1 v"lliatfis' to-say the :three windings on the alternatingcurrncmator are"arrom one anterminals" offthelse windings are: conn ct d,rcspectivelylo 1' H1 1 m 1 With' this form ofconnection, it is possibleIto arrange that the rotor and stator I currents exa'ctly counterbalanceon e another 'ateachipoint of the circuln i'erencefofthe machine, there?being perfect symmetry, between the" windings. jIn Fi"g.' 3thefinotor isto beconne cted in tlie"same' wayf'being Wound. with twelve phases allelectrically adapted to have nating-current commutator generator having'statoi and' rotor" elements, a continuous 'windingcn one of theseelements, and a corresponding discontinuous winding on the 'otherelementextending over its whole circuniference but-- divided electrically bygaps into separate parts, means for driving said generator at constantspeed, excitation means on said generator, an exciting machine for"supplying-alternating current to said excitationflmeans, and means forcontrolling the frequency of such alternating current, power windings onthe alternating current motor,

' leads iconnectingjthese' power windings across "the "respective gaps"between the separate parts of the discontinuous winding, and

brushes" connecti ng electrically "correspond- 'ingpoint sfof thestatorwinding and rotor compensa'tingwinding of the generator.,ivhereby'the magnetic effects o'f the stator and rotor currents of thegenerator neutrnl- -another.**- Y 'n'on'y when-col we aflix our signaa;i NlG-OLASJAPOLSKY.

